A new chromium-based catalyst coated with paraffin for ethylene oligomerization and the effect of chromium state on oligomerization selectivity

被引：34

作者：

Fang, YQ

Liu, YX

Ke, YC

Guo, CY

Zhu, N

Mi, X

Ma, Z

Hu, YL ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Engn Plast, Beijing 100080, Peoples R China

[2] CNPC Key Lab Catalysts, Beijing Lab Catalysts, Beijing 100080, Peoples R China

来源：

APPLIED CATALYSIS A-GENERAL | 2002年 / 235卷 / 1-2期

关键词：

chromium-based catalysts; paraffin (alkanes); ethylene oligomerization; trimerization; hexene;

D O I：

10.1016/S0926-860X(02)00239-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new method is proposed in which a chromium-based catalyst system containing chromium(III) tris (2-ethylhexanoate) (Cr(EH)(3)),2,5-dimethylpyrrole(2,5-DMP), GeCl4 and triethylaluminum (TEA) coated with solid paraffin is used for oligomerization of ethylene. GC-MS and H-1-NMR analyses show that the coated catalyst system prepared via this approach is air-insensitive so it can be stored under ambient conditions. The selectivity for 1-hexene is up to 97.91 wt.%, and only slightly decreases when the catalyst system is exposed in air for 24h; in contrast, the selectivity is only 35.6% for its non-coated counterpart. XPS reveals that an attachment of atmospheric oxygen to catalyst makes the chemical state of chromium change from Cr3+ to Cr6+. Such a change, in turn, reduces remarkably its selectivity for 1-hexene. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：33 / 38

页数：6

共 11 条

[1] THE SELECTIVE TRIMERIZATION OF ETHYLENE TO HEX-1-ENE [J].